Opteka Remote Release Cord for Canon EOS 5D 10D 20D 30D, 40D, & 50D Digital Cameras Opteka Remote Release Cord for Canon EOS 5D 10D 20D 30D, 40D, & 50D Digital Cameras Allows the camera to be released from a distance of up to 36 inches Half-press focuses, full press releases the shutter All Electronic - no batteries needed! Brand New, Sealed!